Type-writing machine.



w. P. HBLMNH.

TYPE WRITING MACHINE. APPLIGATIO'N FILED 00T.1I, 1907.

Patented Apr. 2o, 1909.

.YTM l". HELMOND, OF HARTFORD, CONNCTICUT, ASSIGNORU() UDTJRWOOD TYPE-WRl'llR COMPANY, GF NEW YORK, N.

TYPE -W'RITIN G MACHINE Specification of Lettere Patent.

Fatented April 20, 1909.

Application filed October 17, 1907. Serial No. 397,770.

'/0 all ici/10m it 'may concern.' l

Bc it known that i, W iLLiAM i". HELMOND,

'a citizen ol" the United States, residing in Hart-lord, in the countyof Hartford and f State of Connecticut, have invented certain new anduseful [niproveinents in Type- Writinrbr Machines, of which thefollowing is a speeii'ieation.

This invention relates to the paper feeding uv to ineans for controllingthe pressure rolls that run upon the usual cylindrical platen.

llleZtDS l'or releasingr the rolls, and also for holding thein releasedor locked away-troni the platen during the introduction and adjustmentol the paper sheets.

1;. lin the accoin anying drawings, `Figure 1v is a front view o aplaten traine of an Underwood front-strike writing machine. is aperspective View illustrating the mounting of the rolls and releasahlesprings therey "f for. rig. 3 is an end view of the paper.

guiding devices, showing the pressure rolls Iy released and locked awayfreni the platen. rig. 4 is a View siiniiar to r ig, 3, hut showing theparts in normal positions.

:zo i ln said niacliine the types usually strike i upon the front sideof a platen 1, which is l revoluhly iounted hy means of an axle 2 in theends 3 of a platen frame, said ends rigidly i Sets of front and yconnected by a rod 4. rear pressure rolls 5, 6, are carried upon shafts7, S, said shafts resting in cradles oi' v okes 9, each .of said shaftsor holding ilevices comprising a U-shaped voke portion, and arins 10,11, extending upwardly and ings 12,' 13 to receive the roll shafts andpernnt detachment thereof.

Springs 14, 15, extend in opposite direcf tions from a hracket 16, thelatter secured on said roi 4. Said springs are adjustahly held bhv meansof screws 17, t4 against the inner ends 19, 2U oi levers .vliieh arepivoted at 21, 5

s of typewriting machines, and par- The object of the invention is toprovide i Fig. 2

. r, rearwardly therefrom and having open hearfraine, a link 28connected to an arin 29 ol said lever pulls up a crank il() providedupon springs 14, 15. Said rock shaft is mounted in brackets 32dependingfrom" said rod 4t, and cariies-collars 33, 3ft, each ,having anYinclined or beveled rain-lace $35-, 36, saidcain faces ada tedtovengage tlieopposite edge 37, 38 of sai( levers 1), 20.

By depressing the key 25, the shaft 31 is l rocked to swing both leverarins 37, 38 upwardly to the position indicated in dotted lines, rig. 1,wherehy hotli springs lll, 15 are depressed, as indicated in dotted'lines, and the vokes E) permitted to drop to release the rolls, as atrig', 55. lt will he seen that the cams 2&5, 3o are oppositely disposed,the saine being true as to the levers and as to the springs, thusyenabling the latter to he fulg crunied together, or close to each otherl about inidwzrv hetween the yolies 9, which i is an advantage andconduces to siinplicit)r and reliability as well as producing aninexpensive ronstruction and permitting easy adjustment of eitherspring.

Each oll the cani laces, it will be pei'- ceived, is oll suoli forni asto look the lever in the dotted line position, so that by de )ressing'the key 25 the leverni'uis are held down, there being no action on thepart ol the springs to raise the saine. Thus the operator may freelyadjust the sheets, and may thereafter raise the key 25 to restore therolls to the )laten as atlt'ig. 4. 1 l. aving thus descrihial claim:

1.. in a typewriting machine, the combination with a platen and a platenl'raine, ola pressure roll, a s ning, a yoke caused hy said spring topress tlie roll against the platen,a key-operated rock shalt having acani thereon, and a lever pivoted upon the platen frame and operated bysaid cani. and bearing; against said spring; to release the roll. i 2.in a type-.writing machine, the combination' with a revoluhle platen anda platen l'raine, oi rolls running upon the platen, a" plurality ol'springs, yolzes caused by said springs to press said rolls against theplaten, a rock shaft having cams thereon, ant levers pivoted on theplaten l'raine and operated by said earns and engaging said springs torelease the saine from said rolls.

in); invention, l

l i 5 l 3. ln a typewriting,r inachin'e,`t`ne combinai tion with arevoluble platen, a pla-ten frame,

a` rock shaft 31 having ineaiis to release said andlsetsof rolls mountedto run upon the platen, of shafts i'or said rolls, yokes to hold saidshafts, a bracket on said platen frame,

springs extending in opposite directions l'rom said bracket to engagesaid yokes', and key-operated means bearing ,upon said springs torelease the yokes; said releasing means including a rock shaft andlevers operated thereby to engage the springs, said levers pivoted onthe platen frame.

5. In a typewritin machine, the combination with a revolub e platen anda platen frame, of sets o'f'rolls mounted to run upon the platen, shaftsfor said rolls7 yokes to hold said shafts, a bracket on said platenframe, springs extending in opposite dn'ections from said bracket toengage said yokes, and keyoperated means bearing upon said springs torelease the yokes; said releasing means including a rock shaft andlevers o erated thereby to enga e the springs, sai levers pivoted on thep aten frame, and said rock shaft having oppositely disposed camstoengage said levers. Y

6. 1n a Itypewriting machine,v the combination With a revoluble platenand rolls mount- I tion with a rotating platen, of aset of pres# surerolls, springs to press the rolls against the platen, shafts for suportingtthe rollsf said shafts held by mova le yo es, a rock shaft heldby brackets on a rod attached to the machine; a key for operating saidrock shaft, cams mounted on said rock shaft, and

so formed that they lock the said springs 1 away'froin theyoke-supported rblls, thus releasing the 'pressure between the platenand rolls; and levers pivoted between their ends on brackets, saidlevers bearin on the face of the said cam on one side, an on the otherbearing against said springs.

WILLIAM F. HELMOND.

Witnesses:

W. M. DYORKMAN, MonToN C. TALco'rT.

